Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 634	$ 590
Provision (release)	(23)	(15)
Initial credit losses on PCD loans (1)	0	3
Charge-offs, net of recoveries	(144)	(15)
Balance, end of period	467	563
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	340	252
Provision (release)	(11)	22
Initial credit losses on PCD loans (1)	0	0
Charge-offs, net of recoveries	(120)	0
Balance, end of period	209	274
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	206	232
Provision (release)	(64)	(37)
Initial credit losses on PCD loans (1)	0	3
Charge-offs, net of recoveries	(2)	(2)
Balance, end of period	140	196
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	88	106
Provision (release)	52	0
Initial credit losses on PCD loans (1)	0	0
Charge-offs, net of recoveries	(22)	(13)
Balance, end of period	$ 118	$ 93